Deformed reinforcing-bar.



W. A. COLLINGS.

' DEFORMED REINFORCING BAR.

AIPL1CATION FILED FEB. 24, 1914.

Patented Sept. 7, 1915.

- dent of the city of Kansas City, in the Fatate I tit complicatedmanipulations through an intricate number of rolls of arn WILLIAM A.CQLLT'NGS, OF KANSAS CKTY, MISSOTJ'ET;

I 'lDEF-QLRMED HEINFQlltCTNG-BAR.

Specification of Letters lat'ent.

Patented dept. t, 11915.

Application filed February or, 191 ficrial N0. [320,ll5'2.

To all whom, it may concern Be it known that l, WILIMM A. Continue, acitizen of the United States, and a resi of Missouri, have inventedcertain new and usefullmprovemcnts in Deformed, Heinforcing-Bars;- and Ido hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, and to the numerals of reference marked thereon, which form apart of this specification.

It is a well known fact that although con crete acts admirably undercompression, that it is very liable to fail under tension. Ac cordingly,'he'concrete is usually reinforced by steel reinforcing members disposedbelow the neutral axis in a beam or the like, so that said membersreceive the tension to which the lower layers of concrete are subjected.It has been foun'i, however, that even with reinforcmg members, a beamis liable to failure, owing to the fact that reinforcing elements whichare improperly formed may slip in the concrete and may even, due-totheir configuration, promote a cracking thereof, which'is, of course,dan' gerous and undesirable.

This invention relates ing bar which to a steel reinforcrelative oneanother along the ban The bar disclosed in my invention is readilyformed between rolls for the purpose and does not necessitate aconstruction involving of the bar length of the one configuration, butonly requires the use of simple types of rolls, permitting easy andcheap manufacture of the bar.

it is an ob ect of this invention to pro-- vide a reinforclngbar ofcircular cross-section, though not necessarily so, and with ribsintegrally formed on portions of the periphery thereof and in oflfsetrelation with one another.

lit is also an object of this invention to construct a device adapted toeffectively bond in the concrete, andadording rounded surfaces at thepoints of contact therewith except at the extreme ends of the deforming,elements formed on the bar.

It is further an object of this invention to construct a reinforcing barwherein ribs are helically disposed on the periphery thereof hasintegrally formed thereon helically disposed rounded ribs staggered withan end of each of said ribs affording a flat contact surface to bond inthe concrete to insure a fixed position of the bar therein and toprevent rotation thereof even in slight amounts.

ft is finally an object of this invention to construct a reinforcing barhaving ribs helically disposed thereon so as to prevent sliding orrotational movement of said bar in the concrete.

The invention (in a preferred form) is hereinafter more fully definedand described. in the fication. v

In the drawings: Figure 1. is a top plan view of a portion of areinforcing bar with the ribs shown diagrammatically or straightthereon. Figjjris aside elevation of a portion of a bar showing the ribsin their true helical position upon the-bar. Fig. 3 is a section on line3-3, of Fig. 2. Fig.- 4 is a fragmentary section on line H of Fig. 3.

As shown in the drawings: The bar itself, which is conventionally shownas of circular cross section, is denoted by the reference numeral 1, andduring the process ofrolling the-same is formed with the varioushelically disposed ribs 2, and 3, respectively on its pcriphery.. It isto be noted that each of said ribs has a fiat surface f, forming thetermination of one end thereon and that said flat surfaces are in linewith one another longitudinally of the bar and substantially at rightangles to the surface thereof. As

already stated, it has been found very diificult to roll certainreinforcing bars for the faces of'the'ends of the ribs formed on the barin my invention represents the parting line of the rails, and it isreadily evident that the forming or rolling operation is not only.

practical, but exceedingly simple to perform,

thus chcap'ening the cost of manufacture of the device. It is to befurther noted that the ribs :2, extend for substantially a quarter ofthe circumference around the bar,' andare helically in line with oneanother. 'i' H p The ribs 3, are semrclrcumfe'rentlal with respect tothe bar and, of course, are helicall y disposed thereon. The adjacentends of the respective ribs 2, terminate in a rounded contour as denotedby the reference numeral 5, so that thus a rib is afiorded havdi'cularto the surface of the bar; andthe ing one end flat and substantiallyperpenother end tapered and rounded off relative thereto. The roundedends 5, on certain: of the ribs, afford a smooth and easilybondedsurface on the bar, while the helical disposition of the ribsprevent a rotation of the bar when embedded in the concrete and the.

saine are further prevented from rotation by the'fi'at abutting surfaces4.

I am aware that various details of construction may be varied through awide range without departing from the principles of'this invention. Itherefore do not purpose limiting the patent otherwise than necessitatedby the prior art. I claim as my invention:

In a device ofthe class described, a bar,

v WILLIAM A. COLLINGS.

Witnesses:

CHARLES W. 'HiLLs, Jr., FRANK K. HUDSON;

